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Search For New Heavy Particles Decaying To Z0 Z0 To Llll Lljj In P Pbar Collisions At Sqrts
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Book Synopsis Search for New Heavy Particles Decaying to Z0 Z0 to Llll, Lljj in P Pbar Collisions at Sqrt(s) by :
Download or read book Search for New Heavy Particles Decaying to Z0 Z0 to Llll, Lljj in P Pbar Collisions at Sqrt(s) written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for anomalous production of Z pairs through a massive resonance decay in data corresponding to 2.5-2.9 fb−1 of integrated luminosity in p{bar p} collisions at √s = 1.96 TeV using the CDF II detector at the Fermilab Tevatron. This analysis, with more data and channels where the Z bosons decay to muons or jets, supersedes the 1.1 fb−1 four-electron channel result previously published by CDF. In order to maintain high efficiency for muons, we use a new forward tracking algorithm and muon identification requirements optimized for these high signal-to-background channels. Predicting the dominant backgrounds in each channel entirely from sideband data samples, we observe four-body invariant mass spectra above 300 GeV/c2 that are consistent with background. We set limits using the acceptance for a massive graviton resonance that are 7-20 times stronger than the previously published direct limits on resonant ZZ production.
Book Synopsis Search for New Heavy Particles Decaying to Z0 Z0 ---] Eeee in P - Anti-p Collisions at S**ư by :
Download or read book Search for New Heavy Particles Decaying to Z0 Z0 ---] Eeee in P - Anti-p Collisions at S**ư written by and published by . This book was released on 2008 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of a search for the anomalous production of a massive particle decaying to four electrons via two Z° bosons in 1.1 fb−1 of p{bar p} collisions at √s =1.96 TeV collected by the CDF II detector at Fermilab. We employ optimized electron identification criteria to maximize acceptance and efficiency. We estimate the backgrounds in the invariant mass range 500-1000 GeV/c2 to be 0.028 ± 0.009 (stat) ± 0.011 (syst) events. We observe zero events in this search region. Assuming a Randall-Sundrum graviton production model, we set 95% CL limits on? x BF(G → Z°Z°)
Book Synopsis Search for New Heavy Particles Decaying to Z0 Z0 ---] Eeee in P - Anti-p Collisions at S**1/2 by :
Download or read book Search for New Heavy Particles Decaying to Z0 Z0 ---] Eeee in P - Anti-p Collisions at S**1/2 written by and published by . This book was released on 2008 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the results of a search for the anomalous production of a massive particle decaying to four electrons via two Z° bosons in 1.1 fb−1 of p{bar p} collisions at √s =1.96 TeV collected by the CDF II detector at Fermilab. We employ optimized electron identification criteria to maximize acceptance and efficiency. We estimate the backgrounds in the invariant mass range 500-1000 GeV/c2 to be 0.028 ± 0.009 (stat) ± 0.011 (syst) events. We observe zero events in this search region. Assuming a Randall-Sundrum graviton production model, we set 95% CL limits on [sigma] x BF(G → Z°Z°)
Book Synopsis Search for New Particles Decaying to Dijets in Pbar P Collisions at Radicals by :
Download or read book Search for New Particles Decaying to Dijets in Pbar P Collisions at Radicals written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Heavy Resonances Decaying to Z($\nu\bar\nu}$)V(q$\bar{q}$') in Proton-proton Collisions at $\sqrts}$ by : Armen Tumasyan
Download or read book Search for Heavy Resonances Decaying to Z($\nu\bar\nu}$)V(q$\bar{q}$') in Proton-proton Collisions at $\sqrts}$ written by Armen Tumasyan and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Heavy, Long-lived Particles that Decay to Photons in Ppbar Collisions at Sqrt(s) by : Peter Wagner
Download or read book Search for Heavy, Long-lived Particles that Decay to Photons in Ppbar Collisions at Sqrt(s) written by Peter Wagner and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the results of the first search for heavy, neutral, longlived particles that decay to photons at a hadron collider. We use a sample of +jet+missing transverse energy events in pp̄ collisions at s = 1.96 TEV taken with the Collider Detector at Fermilab. Candidate events are selected based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed. The final result is that we find 2 events, using 570"34 pb−1 of data collected during 2004-2005 at the Fermilab Tevatron, consistent with the background estimate of 1.3"0.7 events.
Book Synopsis Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in $p\bar{p}$ Collisions at $\sqrt{s} by :
Download or read book Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in $p\bar{p}$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for a new heavy particle M produced in association with a top quark, p{bar p} → t(M → {bar t}q) or p{bar p} → {bar t}({bar M} → t{bar q}), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a {bar t}+j or t+j resonance in t{bar t}+jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb−1 collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (p{bar p} → Mt or {bar M} {bar t}) at 95% confidence level from 0.61 pb to 0.02 pb for M masses ranging from 200 GeV/c2 to 800 GeV/c2, respectively.
Book Synopsis Search for a Heavy Resonance Decaying Into a Z+jet Final State in P Anti-p Collisions at S**1/2 by :
Download or read book Search for a Heavy Resonance Decaying Into a Z+jet Final State in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have searched for a heavy resonance decaying into a Z+jet final state in p{bar p} collisions at a center of mass energy of 1.96 TeV at the Fermilab Tevatron collider using the D0 detector. No indication for such a resonance was found in a data sample corresponding to an integrated luminosity of 370 pb−1. We set upper limits on the cross section times branching fraction for heavy resonance production at the 95% C.L. as a function of the resonance mass and width. The limits are interpreted within the framework of a specific model of excited quark production.
Book Synopsis Search for New Particles Decaying to Dijets in PP̄ Collisions at [square Root Symbol] S by : Chao Wei
Download or read book Search for New Particles Decaying to Dijets in PP̄ Collisions at [square Root Symbol] S written by Chao Wei and published by . This book was released on 1996 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New High Mass Particles Decaying to Lepton Pairs in P Anti-p Collisions at S**(1/2) by :
Download or read book Search for New High Mass Particles Decaying to Lepton Pairs in P Anti-p Collisions at S**(1/2) written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Heavy, Long-lived Particles that Decay to Photons in $p \bar{p}$ Collisions at $\sqrt{s}$ by :
Download or read book Search for Heavy, Long-lived Particles that Decay to Photons in $p \bar{p}$ Collisions at $\sqrt{s}$ written by and published by . This book was released on 2007 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the results of the first search for heavy, neutral, longlived particles that decay to photons at a hadron collider. We use a sample of +jet+missing transverse energy events in $p \bar{p}$ collisions at √s = 1.96 TeV taken with the Collider Detector at Fermilab. Candidate events are selected based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed. The final result is that we find 2 events, using 570±34 pb-1 of data collected during 2004-2005 at the Fermilab Tevatron, consistent with the background estimate of 1.3±0.7 events. While our search strategy does not rely on model-specific dynamics, we interpret this result in terms of cross section limits in a supersymmetric model with $\vec{X}$$0\atop{1}$ eG and set a world-best e 01 mass reach of 101 GeV/c2 at e = 5 ns. We can exclude any [gamma]+jet+missing transverse energy signal that would produce more than 5.5 events.
Book Synopsis Search for High-mass Resonances Decaying Into $ZZ$ in P$\bar{p}$ Collisions at $\sqrt{s} by :
Download or read book Search for High-mass Resonances Decaying Into $ZZ$ in P$\bar{p}$ Collisions at $\sqrt{s} written by and published by . This book was released on 2011 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors search for high-mass resonances decaying into Z boson pairs using data corresponding to 6 fb−1 collected by the CDF experiment in p{bar p} collisions at √s = 1.96 TeV. The search is performed in three distinct final states: ZZ → ll−l+l−, ZZ → l+l−??, and ZZ → l+l−jj. For a Randall-Sundrum graviton G*, the 95% CL upper limits on the production cross section times branching ratio to ZZ,?(p{bar p} → G* → ZZ), vary between 0.26 pb and 0.045 pb in the mass range 300
Book Synopsis A search for new heavy particles in Z0 decays at LEP by : Paula Eerola
Download or read book A search for new heavy particles in Z0 decays at LEP written by Paula Eerola and published by . This book was released on 1990 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in $p\bar{p}$ Collisions at $\sqrt{s} by :
Download or read book Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in $p\bar{p}$ Collisions at $\sqrt{s} written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of the Heavy Flavour Fractions in Z+jets Events from Proton-antiproton Collisions at Energy by :
Download or read book Study of the Heavy Flavour Fractions in Z+jets Events from Proton-antiproton Collisions at Energy written by and published by . This book was released on 2008 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of field and particles is the theory that provides the best description of the known phenomenology of the particle physics up to now. Data collected in the last years, mainly by the experiments at the big particle accelerators (SPS, LEP, TEVATRON, HERA, SLAC), allowed to test the agreement between measurements and theoretical calculations with a precision of 10−3 ̦ 10−4. The Standard Model is a Quantum Field Theory based on the gauge symmetry group SU(3){sub C} x SU(2){sub L} x U(1){sub Y}, with spontaneous symmetry breaking. This gauge group includes the color symmetry group of the strong interaction, SU(3){sub C}, and the symmetry group of the electroweak interactions, SU(2){sub L} x U(1){sub Y}. The formulation of the Standard Model as a gauge theory guarantees its renormalizability, but forbids explicit mass terms for fermions and gauge bosons. The masses of the particles are generated in a gauge-invariant way by the Higgs Mechanism via a spontaneous breaking of the electroweak symmetry. This mechanism also implies the presence of a massive scalar particle in the mass spectrum of the theory, the Higgs boson. This particle is the only one, among the basic elements for the minimal formulation of the Standard Model, to have not been confirmed by the experiments yet. For this reason in the last years the scientific community has been focusing an increasing fraction of its efforts on the search of the Higgs boson. The mass of the Higgs boson is a free parameter of the Standard Model, but the unitarity of the theory requires values not higher than 1 TeV and the LEP experiments excluded values smaller than 115 GeV. To explore this range of masses is under construction at CERN the Large Hadron Collider (LHC), a proton-proton collider with a center of mass energy of 14 TeV and a 1034 cm−2 s−1 peak luminosity. According to the present schedule, this machine will start to provide collisions for the experiments at the end of 2008. In the meanwhile the only running accelerator able to provide collisions suitable for the search of the Higgs boson is the Tevatron at Fermilab, a proton-antiproton collider with a center of mass energy of 1.96 TeV working at 3 · 1032cm−2s−1 peak luminosity. These features make the Tevatron able for the direct search of the Higgs boson in the 115-200 GeV mass range. Since the coupling of the Higgs boson is proportional to the masses of the particles involved, the decay in b{bar b} has the largest branching ratio for Higgs mass
Book Synopsis A Search for New Heavy Particles in Z ̊decays at LEP by : Paula Eerola
Download or read book A Search for New Heavy Particles in Z ̊decays at LEP written by Paula Eerola and published by . This book was released on 1990 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for New Particles in Z Decay by :
Download or read book A Search for New Particles in Z Decay written by and published by . This book was released on 1989 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have searched 310 hadronic Z decays for evidence of new quarks and leptons. We set lower mass limits of 40.7 GeV/c2 for top, 45 GeV/c2 for bottom prime, and 42.4 GeV/c2 for a heavy neutral lepton assuming their decays are predominantly via the charged current. Limits are also set for other decay modes and for mixtures of decay modes. 10 refs., 10 figs.
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